package com.chensi.controller;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

@Controller
public class KaptchaController {
	private Producer captchaProducer = null;  
	  
    @Autowired  
    public void setCaptchaProducer(Producer captchaProducer) {  
        this.captchaProducer = captchaProducer;  
    }  
  
    /**
     *  kaptcha.border  是否有边框  默认为true  我们可以自己设置yes，no  
		kaptcha.border.color   边框颜色   默认为Color.BLACK  
		kaptcha.border.thickness  边框粗细度  默认为1  
		kaptcha.producer.impl   验证码生成器  默认为DefaultKaptcha  
		kaptcha.textproducer.impl   验证码文本生成器  默认为DefaultTextCreator  
		kaptcha.textproducer.char.string   验证码文本字符内容范围  默认为abcde2345678gfynmnpwx  
		kaptcha.textproducer.char.length   验证码文本字符长度  默认为5  
		kaptcha.textproducer.font.names    验证码文本字体样式  默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)  
		kaptcha.textproducer.font.size   验证码文本字符大小  默认为40  
		kaptcha.textproducer.font.color  验证码文本字符颜色  默认为Color.BLACK  
		kaptcha.textproducer.char.space  验证码文本字符间距  默认为2  
		kaptcha.noise.impl    验证码噪点生成对象  默认为DefaultNoise  
		kaptcha.noise.color   验证码噪点颜色   默认为Color.BLACK  
		kaptcha.obscurificator.impl   验证码样式引擎  默认为WaterRipple  
		kaptcha.word.impl   验证码文本字符渲染   默认为DefaultWordRenderer  
		kaptcha.background.impl   验证码背景生成器   默认为DefaultBackground  
		kaptcha.background.clear.from   验证码背景颜色渐进   默认为Color.LIGHT_GRAY  
		kaptcha.background.clear.to   验证码背景颜色渐进   默认为Color.WHITE  
		kaptcha.image.width   验证码图片宽度  默认为200  
		kaptcha.image.height  验证码图片高度  默认为50
     */
    @RequestMapping("/captcha-image")  
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {  
  
        response.setDateHeader("Expires", 0);  
        // Set standard HTTP/1.1 no-cache headers.  
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).  
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
        // Set standard HTTP/1.0 no-cache header.  
        response.setHeader("Pragma", "no-cache");  
        // return a jpeg  
        response.setContentType("image/jpeg");  
        // create the text for the image  
        String capText = captchaProducer.createText();  
        // store the text in the session  
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);  
        // create the image with the text  
        BufferedImage bi = captchaProducer.createImage(capText);  
        ServletOutputStream out = response.getOutputStream();  
        // write the data out  
        ImageIO.write(bi, "jpg", out);  
        try {  
            out.flush();  
        } finally {  
            out.close();  
        }  
        return null;  
    }  
}
